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US 12,761,388 B2Granted
Combination of X and Y dipole waveforms that enhances event signals in the geological stratum
AssigneeSchlumberger Technology Corporation
InventorsNobuyasu Hirabayashi, Naoki Sakiyama, Manish Lal Khaitan
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Abstract
Embodiments presented provide for processing of sonic images. In specific embodiments, an automated method for separation of upper and lower reflector signals is presented.
Claims18
A method for analysis of an acoustic signal, comprising:
- placing a multi-azimuth logging tool within a geological stratum to be evaluated;
- activating the multi-azimuth logging tool and sending a signal into the geological stratum;
- receiving, by virtual receivers of the multi-azimuth logging tool, reflected signals from the geological stratum;
- stacking waveforms of the reflected signals at positions of the virtual receivers, wherein the stacking waveforms is accomplished by defining the virtual receivers for the multi-azimuth logging tool, and wherein each virtual receiver is defined in between two azimuthal receivers of the multi-azimuth logging tool;
- performing a polarity modification of the stacked waveforms;
- combining polarity modified stacked waveforms for both X- and Y-dipole waveforms;
- and
- constructing waveforms at fixed borehole azimuths.
5 more elements
A method for processing sonic images, comprising:
- sending a sonic signal into a geological stratum;
- receiving a reflected sonic signal from the geological stratum;
- filtering the reflected sonic signal to produce a filtered waveform;
- performing an FK filtering on the filtered waveform to produce FK filtered data, wherein purely horizontal waves are kept in one of an up-going or a down-going wave, and wherein an operator chooses when the purely horizontal waves are kept in the up-going or the down-going wave;
- applying a migration of the FK filtered data;
- creating a migration image of data after the migration of the FK filtered data;
- performing a derivative of a depth position on the data of the migration image to produce derivative results;
- and
- adjusting the derivative results to earth coordinates.
6 more elements
A method for analysis of an acoustic signal, comprising:
- placing a multi-azimuth logging tool within a geological stratum to be evaluated;
- activating the multi-azimuth logging tool and sending a signal into the geological stratum;
- receiving, by virtual receivers of the multi-azimuth logging tool, reflected signals from the geological stratum;
- stacking waveforms of the reflected signals at positions of the virtual receivers;
- performing a polarity modification of the stacked waveforms, wherein the polarity of the stacked waveforms is modified according to a source polarization and the positions of the virtual receivers;
- combining polarity modified stacked waveforms for both X- and Y-dipole waveforms;
- and
- constructing waveforms at fixed borehole azimuths.
5 more elements
Dependencies are inferred from the claim text.